Developmental characterization of pods of ground orchid Spathoglottis plicata 'Alba'
2007
Soguillon, S. | Rosario, T. L., Philippines Univ. Los Baños, College, Laguna (Philippines). Crop Science Cluster
Pods developed from self-pollination of Spathoglottis plicata 'Alba' were harvested at different stages of maturity, i.e.,10, 13, 25, and 28 days after pollination(DAP). They were characterized in terms of size, distinction of ridges, state of corolla and ovule characteristics. At 20 DAP, the pods were still immature and the ovules ovoid with round to elongated cells. There was a remarkable increase in pod size at 25 DAP and the ridges were distinct. At 28 DAP, the pod had brown and powdery ovules, which were signs of maturity. The basal, middle and tip sections of the freshly harvested pods did not have embryo at all stages of maturity. Although pollination took places, fertilization did not proceed or if it did, the embryo might have degenerated and did not develop. Samples of ovules from the green pod cultured in-vitro also showed lack of embryos. Similar studies conducted on the pods of violet-flowered S.plicata showed development of embryos which germinated easily in in-vitro culture.The pollen grains of S.plicata and S.plicata 'Alba' were fertile but since there were no embryos formed in the latter, self-incompatibility may be a characteristic of this variety.
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